Lithium-Doping Stabilized High-Performance P2–Na0.66Li0.18Fe0.12Mn0.7O2 Cathode for Sodium Ion Batteries

• DOI: 10.1021/jacs.9b01855
• Publication Date: 2019-04-01T14:00:15Z
• Authors: Lufeng Yang; Xiang Li; Jue Liu; Shan Xiong; Xuetian Ma; Pan Liu; Jianming Bai; Wenqian Xu; Yuanzhi Tang; Yan-Yan Hu; Meilin Liu; Hailong Chen
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

While sodium-ion batteries (SIBs) hold great promise for large-scale electric energy storage and low speed vehicles, the poor capacity retention of cathode is one bottlenecks in development SIBs. Following a strategy using lithium doping transition-metal layer to stabilize desodiated structure, we have designed successfully synthesized novel layered oxide P2–Na0.66Li0.18Fe0.12Mn0.7O2, which demonstrated high 190 mAh g–1 remarkably ∼87% after 80 cycles within wide voltage range 1.5–4.5 V. The outstanding stability attributed reversible migration during cycling elimination detrimental P2–O2 phase transition, revealed by ex situ X-ray diffraction solid-state nuclear magnetic resonance spectroscopy.